import time
scale = 10
print("------执行开始------")
for i in range(scale+1):
    a,b = '**'* i,'..'*(scale - i)
    c=(i/scale)*100
    print("%{:^3.0f}[{}->{}]".format(c,a,b))
    time.sleep(0.1)
print("------执行结束------")